Specific gravity: 3.56
Colour: Blue-green, grey-white, dark brown, colourless
Johannsenite is found in contact metamorphic environments
johannsenite and H2O to rhodonite and xonotlite
6CaMnSi2O6 + H2O → 6Mn2+SiO3 + Ca6Si6O17(OH)2
At Pueblo, Mexico, johannsenite occurs in calcite veins in rhyolite and is altered to rhodonite and xonotlite according to the above equation (DHZ 2A p421).
Common impurities: Ti,Al,Fe,Mg,Na,K,C,P,H2O
Back to Minerals